American standard Materials: ASTM a-197, ASTM A47 Dimensions: Asme b16.3, b16.14, b16.39 (union dimensions) Threads: ANSI b1. We can supply American standard, British standard, en standard, and other special requirements. Both class 150# and class 300# available, and size ranges from 1/8" to 6". The brief introduction as follows: American standardMaterials: ASTM a-197, ASTM A47Dimensions: Asme ...